What is the major advantage of high altitude observations?（）<br>A:Errors due to unusual parallax are eliminated<br>B:The same body can be used for a fix from observations separated by several minutes<br>C:The declination is the only information needed from the almanac<br>D:The semidiameter correction of the sextant altitude is eliminated

What is the major advantage of high altitude observations?（）
A:Errors due to unusual parallax are eliminated
B:The same body can be used for a fix from observations separated by several minutes
C:The declination is the only information needed from the almanac
D:The semidiameter correction of the sextant altitude is eliminated

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